Bag making machine



Dec.f5, 1939.

A. POTDEVIN BAG MAKING MACHINE Filed Feb. 25', 1938 INVENTOR WWW Patented Dec. 5, 1939 UNITED STATES PATENT OFFICE BAG MAKING MACHINE Application February 25, .1938, Serial No. 192,455

Claims.

This invention is directed to bag making machinery in general and more specifically is directed to new and improved apparatus for perforating the bag material preparatory to dividing g the material into bag lengths.

My machine is particularly well adapted for the handling of bag making material such as cellulose acetate, cellulose hydrate, glassine, and rubber-likematerials such as "Pliofllm, a me- 10 tallic chloride addition product of rubber. While the machine is adapted for the handling of any of the usual bag materials, it has been designed with the materials specifically mentioned above in mind inasmuch as these materials are dimcult to handle in automatic machinery, being very easily torn and having a tendency to cling to and clog the machine.

In general, the present machine provides for continuously advancing the material, forming the tubing at bag length intervals and separation or bag length are preferably trimmed so as to remove the last vestige of any cracks or slightly torn places that may be produced at the bag corners when the tubing is divided into bag lengths.

In the accompanying drawing:

Fig. 1 is a side elevational view in part section of partof a bag making machine embodying my invention;

Fig. 2 is a plan view of the apparatus illustrated in Fig.1;

Fig. 3 is a section on the line 3-3 of Fig. 2; Figs. 4 and 5 are cross sectional views of a perforator-plate constituting part of my machine.

Referring to the drawing in detail: 2 designates the bag making material. This material, as above noted, may be cellulose acetate, cellulose hydrate, glassine, Pliofllm", etc. This material is taken from a supply roll in the usual way and fed into the machine continuously. This equipment is old and has not been illustrated nor will it be described in detail.

The material 2 as it passes into the machine tinuously advancing between a pair of forwarding rollers 8 and from thence to a pair of perforator rollers 8, each of the latter carrying a perforator Ill. The functions of the perforators II is to persame into a tube, perforating the walls of the is tubed about a former-plate 4, the tubing conforate the tubed material at bag length intervals.

The former-plate 4 is provided with a'longitudinally extending groove I2 in its upper face for the reception of a perforator-plate Hi. This 6 plate, as is plainly apparent from Fig. 2, extends longitudinally of the machine and its forward end I8 projects beyond the former-plate and is widened to about the width of the former-plate.

It will be understood that in'its initial forward 10 movement the tubing moves forward relatively to the former-plate and to the perforator-piate- The forward end of the former-plate 4 is biv furcated and terminates at the rollers 8, as shown at 20, instead of, as in prior practice, terminatiii ing at the forwarding rollers 6.

The perforators l0 which, as above mentioned,

' are carried by the rollers 8, extend, as will be appreciated, transversely of the machine and their shape depends upon the desired shape of 20 the bag ends.

The perforator-plate I6 is a flat metal plate, adapted to be reciprocated intermittently with respect to the former-plate. The rear end of the perforator-plate carries a plate 2 2 which receives the lower end of a lever 24. This lever is pivoted at 26 and its upper end carries a roller 28 adapted to cooperate with a cam roller 30. The function of the cam roller is to positively retract the perforator-plate as will be brought out hereinso after.

The upper and lower faces of the perforatorplate I8 are provided with grooves 32. The grooves on the upper face of the perforato'r-plate may be in register with the grooves on the lower 35 face of the plate, as shown in Fig. 4,'or in staggered-relation thereto, as shown in Fig. 5. The grooves 32 are shown extending longitudinally of the machine but this is merely for purposes of illustration, inasmuch as the direction in which they extend depends upon the shape to be given the end of the bag length. Generally speaking they may be said to extend at right angles to the line of division of the tubing. If the tubing is to be divided straight across then the grooves 32 would extend lengthwise of the machine. On the other hand, if the line of division is diagonal to the tubing then the grooves would extend more or less diagonally of the longitudinal axis of the machine. The spacing of the grooves may vary 5 with different types of material. It will be understood that in operation the tubing is perforated between the grooves, and consequently the spacing of the grooves as well as the width of the grooves must be such that suflicient material is 55 explained, and as shown at 20.

left unperforated at each operation to enable the tubing after the perforating step to be drawn forward to the next step of the dividing operation.

As the tubed material advances about the former t and the perforator-plate it it enters between the rollers 8, and as the perforators Ill are rotated into engagement with the tubed material above and below the perforator-plate t6 the perforator-plate l6 will be picked up and drawn forward at the same speed as that of the per forators. The perforator-plate prior to this action is stationary. As the tubing and the perforator-plate and the perforators it advance, the perforators will perforate the tubed material at the areas between the extending grooves 32, to

much as the tubing is moving through the ma-' chine at a high rate of speed and if the tubing should open up after it has been. perforated it' will clog the machine.

The perforator-plate i6 after the operation of the perforators i0 is retracted by the cam roller 39, but before the perforators pick this plate up again the cam roller 30 rotates out of contact with the lever roller 28, so that when the perforators pick up the plate the plate is free, so far as the cam 30 is concerned, to be moved forwardat the speed of the perforators and of the tubing. When the plate reaches the end of its forward stroke the cam 30 has rotated into position fully to retract the perforator-plate, ready for the next cycle of operation.

Heretofore it has been the practice to terminate the former-plate d at the forwarding rollers 6; as above mentioned, but in the present machine the sides of the forward end of the formerplate have been extended forward past the rollers 6 to a point adjacent the rollers 8, as already This is of advantage, particularly when handling materials which are somewhat elastic, in that it prevents contraction of the material between the end of the former-plate and the head of the perforatorplate, thereby avoiding plugging of the machine at this point. The practically continuous guide for the tubing provided by extending the formerplate also holds the tubing to a straight path,

sldewise displacement being thereby prevented,

thereby insuring continuous operation at much higher speeds and with less trouble than-heretofore thought possible.

During the perforating operation the tubing is engaged by the rollers 34, and hence is under tension, and were the former-plate not extended up to the rollers 8 as above explained the'tendency of the tubing to contract laterally between the end of the former-plate and the head of the perforator-plate would be very pronounced.

As the tubing continues its forward motion the perforated area of the tubing passes between the rollers 86 and 38 and the cutters '44 carried by these rollers function to cut through the edges of the tubed material to provide, at the corners of what is eventually to be the leading end of each bag or the end to be bottomed, a projecting tab 6%. The other end of each bag length will at the same time be provided with a cut-out at which is complementary to the tabs as.

The leading end of the tubing by this time has reached the overspeeded rollers Q2 and the latter bag lengths along the line of the perforations therein, and as the trailing end of each bag length passes the punch as the latter will functionto trim the cut-outs t8 so that any cracks or splinters at the corners willbe eliminated.

It is to be understood that changes may be made in the details of construction and arrangement of parts herein described within the spirit and scope of my invention.

What I cl is: p

1. A machine of the class'described comprising in combination a perforator-plate extending lengthwise of the machine and provided on opposite faces with grooves, smooth perforators mounted on opposite sides of said perforatorplate, means for tubing material about the perforator-plate, means for bringing the said perforators and the grooved perforator-plate into operative relation with respect to each other with. the smooth perforators extending across said plate intermittently to perforate the tubed material through both walls between the grooves in the perforator-piate and at bag length intervals while leaving intact those portions of the tube overlying said grooves.

2. A machine of the class described comprising in combination a perforator-plate provided on one face with a plurality of grooves disposed side by side, a smooth 'perforator mounted at the grooved side of the perforator-plate, means for tubing material about the perforator-plate, means for bringing the perforator and perforator-plate into operative relation with respect to each other with the smooth perforator extending across the grooved perforator plate to draw the perforatorplate forward at the speed of the perforator, and

to perforate the wall of the tubed material between the grooves in the perforator-plate, while leaving intact the portions of the tubed material overlying said grooves and means thereafter positively to retract the perforator-plate within the tubed material.

3. A machine of the class described comprising in combination a perforator-plate extending lengthwise of the machine and provided on op- I posite faces with grooves, the grooves on one face registering with the grooves on the opposite face, perforators mounted on opposite sides of said perforator-plate, means for tubing material about the perforator-plate, means for bringing smooth portions of the said perforators and the smooth portions of the perforator-plate intermediate said in combination a perforator-plate. extending lengthwise of the machine and provided on opposite faces with grooves, the grooves on one face being staggered with respect to the grooves on the opposite face, perforatorsimounted on oppov site sides of said perforator-plate, means for tubing material about the perforator-plate, means for bringing smooth portions of the said perforators and the smooth portions of the perforator-plate intermediate said grooves into operative relation with respect to each other intermittently to perforate the tubed material through both walls intermediate the grooves in the perforator-plate and atbag length intervals while leaving intact those portions of the tubed material overlying the grooves in-the perforator plate.

5. A machine of the class described comprising in combination a former-plate, a perforator- 5 plate slidably mounted in the said former-plate and provided on opposite faces with grooves, smooth perforators mounted on opposite sides of said perforator-plate, means for tubing material about the formereplate and perforator-plate, and means for bringing the said smooth perforators and the perforator-plate into operative relation with respect to each other with the smooth perforators registering with the smooth portions of the perforator plate intermediate the grooves '25 in the plate intermittently to perforate the tubed material through both walls intermediate the said grooves and at bag length intervals while leaving intact those portions of the tubed mate? rial overlying said grooves.

6. A machine of the class described comprising in combination a former-plate, a plate slidable therein, a pair of rollers immediately adjacent the forward end of the former-plate, and a perforator carried by each of said rollers and 5 cooperating with the faces of said slidable plate.

7. A machine of the class described comprising in combination a former-plate, a perforatorplate slidable therein and provided on each face with grooves, a pair of rollers immediately adja- 40 cent the forward end of the former-plate, and a perforator carried by each of said rollers extending transversely of the machine and cooperating with said grooves.

8. A machine of the class described comprising in combination a former-plate, a perforatorplate slidable therein and provided on each face with grooves extending longitudinally of the machine, a pair of rollers immediately adjacent the forward end of the former-plate, a perforator carried by each of said rollers extending transversely of the machine and cooperating with said grooves, the sides of the forward end of said former-plate terminating immediately adjacent said rollers.

9. A machine of the class described comprising in combination a stationary former-plate,- a

, perforator-plate slidable therein, means for continuously advancing tubed material about said plates, a pair of rollers adjacent the forward end 0 of said former-plate, perforators carried thereby and cooperable with the perforator-plate intermittently to draw the same forward at the speed of the advancing tube and simultaneously to perforate the walls of the tube, the former-plate terminating sufliciently far forward to reduce the gap between it and the head of the perforatorplate when the latter is drawn forward to not substantially more than the length of the stroke of the perforator-plate. 70 10. A machine of the class described comprisingin combination a perforator plate extending leng thwise of the machine and provided on opposite faces with grooves, smooth perforators mounted on opposite sides of said perforator 75 plate, means for tubing material about the perforator plate, means for bringing the said perforators and the grooved perforator plate into operative relation with respect to each other with the smooth perforators extending across said plate, intermittently to effect forward move- 5 ment of the perforator plate at the same speed as the said perforators and to effect perforation of the tubed material through both walls between the grooves in the perforator plate and at has length intervals while leaving intact those porlo tions of the tube overlying said grooves.

11. A machine of the class described comprising in combination a perforator plate having grooves in opposite sides thereof lying side by side, means.for advancing, lengthwise of the 35 plate, tubed material disposed about the said perforator plate, smooth perforators mounted on opposite sides of said perforator plate. and means for bringing said perforators intermittently into operative relation with respect to said 90 plate with the smooth perforators extending across the grooved plate to perforate the tubed material at bag length intervals through those portions of the material lying intermediate the grooves of the perforator plate while leaving intact those portions of the material overlying the grooves.

12. A machine of the class described comprising in combination a perforator plate having grooves in opposite sides thereof lying side by 30 side, means for advancing, lengthwise of said perforator plate, tubed material disposed about the plate, smooth perforators mounted on oppo-' site sides of said perforator plate and extending.

, transversely thereof, and means for intermit-- tently bringing said perforators into operative relation to said plate with the smooth perforators extending across the grooves of the plate momentarily to advance said perforator plate and the tubed material together and simultaneously to 4o and across said grooves, and means for rotating said smooth edged perforators to move the perforator plate into operative relation with respect to the perforators and provide a curved row 55 of perforations in the tubed walls while leavin intact those portions of the tube overlying said grooves.

14. A machine of the class described comprising in combination a perforator plate provided on opposite faces with depressions, smooth perforators mounted on opposite sides of said perforator plate and extending transversely of the machine, means for tubing material about the perforator plate, means for advancing the tubed material along the plate, means for bringing the perforators into operative relation with respect to the perforator plate intermittently with the smooth perforators extending across the 7 plate, the plate and perforators as well as the tubed material moving at this instant substantially at the same speed and the smooth perforators perforating the tubed material while leaving intact those portions of the material overlying the depressions in the plate, and means thereafter to subject the tubed material to increased tension to divide the material along said perforations.

15. In a machine of the class described, means for advancing a continuous web, means for folding over the edges of the web to form a tube, perforating elements contacting both walls of the tube, one of said elements comprising a plate within said tube, the other element comprising 10 perforators mounted above and below said plate and tube, one oi. said elements having grooves in the face thereof at spaced intervals, the smooth portions of said grooved element lying between said grooves registering and cooperating with smoothportions on the other element to perforate both walls of the tube between said grooves while leaving intact those portions of the v tube overlying said grooves.

ADOLPH mm. 

